Worm-gear type ceiling fan motor

ABSTRACT

A worm-gear type ceiling fan motor comprises a stator, a rotor, two bearings, two heat-expelling covers, the stator and the two bearings are fixed on a motor shaft, the rotor is fixed on the bearings by cooperating with the heat-expelling covers. A plurality of hollow slots are formed on surface of the heat-expelling covers, in which are provided with plural worm-gear blades, when the rotor rotates, fresh air is instantly introduced into the ceiling fan motor via the upper heat-expelling cover expelled out from the lower heat-expelling cover, thus, air is circulated through the inside of the worm-gear type ceiling fan motor to cool down the working temperature and prolong the service life of the ceiling fan motor accordingly.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a worm-gear type ceiling fan motor withworm-gear air-cooling system which is capable of cooling the workingtemperature of the ceiling fan motor, improving air-circulatingefficiency and prolonging its service life.

2. Description of the Prior Arts

A traditional ceiling fan comprises a driving motor, a fly-wheelconnected to the driving motor, and a plurality of fan blades fixed onthe fly-wheel. The driving motor is an external revolving motor, it hasto produce air circulation by rotating the fly-wheel, the motor coverand the fan blades together. However, there are still some problems asfollows need to solve:

First, power is wasted since the driving motor has to drive thefly-wheel, the motor cover and the fan blades to rotate together, sothat the working temperature of driving motor will be high and theservice life will be affected.

Second, the driving motor, the fly-wheel and the motor cover is locatedat the center of the traditional ceiling fan, only the fan blades canrotate to produce air movement and there still exists a turbulence inthe central space corresponding to the driving motor, the fly-wheel andthe motor cover. Accordingly, the air circulating speed right below theceiling fan motor is very slow.

The present invention has arisen to mitigate and/or obviate theafore-described disadvantages.

SUMMARY OF THE INVENTION

The primary object of the present invention is to provide a worm-geartype ceiling fan motor with worm-gear air-cooling system which iscapable of cooling down the working temperature of the ceiling fanmotor, improving efficiency of air movement and prolonging service life.When the worm-gear type ceiling fan motor rotates, forward for example,a plurality of worm-gear blades on the surface of the upperheat-expelling cover will instantly introduce fresh air into inner spaceof the worm-gear type ceiling fan motor through a plurality of hollowslots, and expelling it out from the hollow slots of a lowerheat-expelling cover, through this way, air is circulated through theinside of the worm-gear type ceiling fan motor, so as to cool down theworking temperature of the motor effectively, and to prolong its servicelife tremendously.

The second object of the present invention is to provide a worm-geartype ceiling fan motor capable of assisting in producing air circulationbellow the central part of the ceiling fan motor.

The present invention will become more obvious from the followingdescription when taken in connection with the accompanying drawings,which show, for purpose of illustrations only, the preferred embodimentin accordance with the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of a worm-gear type ceiling fan motor inaccordance with the present invention;

FIG. 2 is an assembly view of the worm-gear type ceiling fan motor inaccordance with the present invention;

FIG. 3 is an assembly cross sectional view of worm-gear type ceiling fanmotor in accordance with the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 1-3, a worm-gear type ceiling fan motor in accordancewith a preferred embodiment of the present invention is shown andgenerally including: a motor shaft 10, a stator 20, a rotor 30, twobearings 40 and two heat-expelling covers 50.

The motor shaft 10 is a hollow tube for allowing the passage of a powersource, and a top end of the motor shaft 10 is hung on the ceiling.

The stator 20 is fixed to the motor shaft 10 and produces magneticrotating force after the power is on.

The rotor 30 is moveably mounted outside the stator 20 and interiorlyprovided with an induction wall 31 employed to rotate the rotor 30 underthe influence of the stator 20. At two opposite sides of the rotor 30are formed with two pairs of positioning posts 32, respectively.

The bearings 40 are fixed at two opposite positions on the motor shaft10.

The heat-expelling covers 50, including an upper cover and a lowercover, are fixed on the bearings 40 through a central hole 51, coveredface to face and fastened to the positioning posts 32 on both sides ofthe rotor 30 through fasteners 54. On the surface of the heat-expellingcovers 50 is formed with a plurality of through slots 52 in which areprovided plural worm-gear blades 53 whose angles are specially designedin accordance with each heat expelling cover.

When the worm-gear type ceiling fan motor 50 rotates, the worm-gearblades 53 on the upper heat-expelling cover 50 will instantly introducethe fresh air A above the motor into the space between the stator 30 andthe rotor 20 through the hollow slots 52, and expelling it out from thelower heat-expelling cover 50. Through this way, air A is circulatedthrough the inside of the worm-gear type ceiling fan motor, so as tocool down the working temperature of the motor effectively, and toprolong its service life tremendously. Furthermore, since the worm-gearblades 53 of the heat-expelling covers 50 can produce strong aircirculation, so that the problem of weak air circulation bellow theconventional ceiling fan motor can be solved.

While we have shown and described various embodiments in accordance withthe present invention, it should be clear to those skilled in the artthat further embodiments may be made without departing from the scope ofthe present invention.

1. A worm-gear type ceiling fan motor comprising a stator, a rotor, twobearings, an upper heat-expelling cover and a lower heat-expellingcover, the stator and the two bearings fixed on a motor shaft, the rotorfixed on the bearings by cooperating with the upper and the lowerheat-expelling covers; wherein a plurality of hollow slots are formed onsurface of the upper and the lower heat-expelling covers, in which areprovided with plural worm-gear blades, when the rotor rotates relativeto the stator, the worm-gear blades on the surface of the upperheat-expelling cover will instantly introduce fresh air into inner spaceof the worm-gear type ceiling fan motor through the hollow slots, andexpelling it out from the hollow slots of the lower heat-expellingcover, through this way, air is circulated through the inner space ofthe worm-gear type ceiling fan motor.
 2. The worm-gear type ceiling fanmotor as claimed in claim 1, wherein a plurality of positioning postsare formed at two opposite sides of the rotor, and the upper and thelower heat-expelling covers are fixed to the respective positioningposts through fasteners.